If 0000 exists at all, it's surely only into Samsung's hands. Better NEVER expect it
Root would allow you to easily downgrade, except if you're on fw >1280, which would mean no possible root anymore for now.

Unfortunately, the TV automatically updated itself and the 1290 version is retained, but the service personnel said that the "zero" version allows to put on the TV, you got it. A version of zero means putting the TV first came out, the first version!

But anyone got any older version T-GFP9DEUC XXXX, please share it with me! Thanks!